Axial piston pump clearance self-adapting adjusting device and adjusting method between port plate and cylinder

Abstract

The application provides an axial plunger pump flow distribution disc and cylinder gap self-adapting adjusting device, which comprises a cylinder, a flow distribution disc, a gap detecting mechanism and an adjusting control mechanism; the gap detecting mechanism comprises a magnetic component, a magnetic field generator and a magnetic flux detecting sensor; the magnetic component is arranged on the cylinder, and the magnetic field generator and the magnetic flux detecting sensor are arranged on the flow distribution disc; the adjusting control mechanism is connected with the magnetic flux detecting sensor and the magnetic field generator respectively; the magnetic flux detecting sensor is used to detect the magnetic field strength change between the magnetic component; the adjusting control mechanism can obtain the gap between the cylinder and the flow distribution disc through the magnetic field strength change, control the magnetic field generator to generate different magnetic fields, and the magnetic field generator can interact with the magnetic component to adjust the gap between the cylinder and the flow distribution disc. The technical scheme can improve the wear and leakage problems, and improve the service life and performance of the pump.

Description

Technical Field

[0001] This invention relates to the field of hydraulic technology, and more specifically to an adaptive adjustment device for the gap between an axial distribution plate and a cylinder block. Background Technology

[0002] Axial piston pumps are an important hydraulic power source. The pistons, through the combined action of the cylinder and swashplate, change their internal volume to achieve periodic oil intake and discharge. When the piston cavity volume increases, oil flows into the cylinder through the slots on the distributor plate; when the piston cavity volume decreases, oil flows out of the piston cavity through the slots on the cylinder and distributor plate. Since the cylinder rotates under the drive of the shaft, a certain gap is usually maintained between the cylinder and the distributor plate to form an oil film and avoid friction. If the gap is too small, surface wear will be accelerated; if the gap is too large, oil leakage will be accelerated. Therefore, ensuring that the gap between the distributor plate and the cylinder is within a reasonable range is crucial. Currently, the gap between the cylinder and the distributor plate in existing axial piston pumps is not adjustable. As use progresses, the gap changes, easily leading to increased wear or leakage, reducing the performance and lifespan of the axial piston pump. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an adaptive adjustment device for the clearance between the axial piston pump distribution plate and the cylinder block, which can automatically adjust the clearance size, solve the problem of excessively large or small axial equal-space clearance and uneven wear due to unequal axial clearance, and improve wear and leakage performance.

[0004] To address the aforementioned technical problems, this invention provides an adaptive adjustment device for the clearance between the distributor plate and cylinder block of an axial piston pump, comprising a cylinder block, a distributor plate, a clearance detection mechanism, and an adjustment control mechanism. The clearance detection mechanism includes a magnetic component, a magnetic field generator, and a magnetic flux detection sensor. The magnetic component is disposed on the cylinder block, and the magnetic field generator and the magnetic flux detection sensor are disposed on the distributor plate. The adjustment control mechanism is connected to the magnetic flux detection sensor and the magnetic field generator, respectively. The magnetic flux detection sensor is used to detect changes in magnetic field strength between itself and the magnetic component. The adjustment control mechanism can obtain the clearance between the cylinder block and the distributor plate through the changes in magnetic field strength and control the magnetic field generator to generate different magnetic fields. The magnetic field generator can interact with the magnetic component to adjust the clearance between the cylinder block and the distributor plate.

[0005] In a preferred embodiment, the magnetic component is a plurality of magnetic blocks, which are embedded inside the end face of the cylinder body; the plurality of magnetic blocks are evenly spaced along a circumferential direction on a circumference with the same outer diameter as the distribution plate, and are placed between the two plunger cavities of the cylinder body.

[0006] In a preferred embodiment, a magnetic sheet is included, which is fixedly connected to the distribution plate; a plurality of magnetic field generators are uniformly arranged on the circumference of the magnetic sheet with the same outer diameter as the distribution plate, and the magnetic field generators can generate different magnetic fields according to the input current; the plurality of magnetic blocks are adjusted to adjust the gap between the cylinder and the distribution plate under the action of the magnetic fields of the plurality of magnetic field generators.

[0007] In a preferred embodiment, a plurality of magnetic flux detection sensors are placed inside the distribution disk, and are evenly distributed along the outer edge of the distribution disk.

[0008] In a preferred embodiment, the magnetic block, the magnetic field generator, and the magnetic flux detection sensor are in a one-to-one correspondence.

[0009] The present invention also provides an adaptive adjustment device for the clearance between the distributor plate and the cylinder block of an axial piston pump, comprising a cylinder block, a distributor plate, a clearance detection mechanism, and an adjustment control mechanism; the clearance detection mechanism comprises multiple magnetic blocks, multiple magnetic field generators, and multiple magnetic flux detection sensors; the multiple magnetic blocks are uniformly arranged on the cylinder block along the circumference, the multiple magnetic field generators are uniformly arranged on the distributor plate along the circumference, and the multiple magnetic flux detection sensors are uniformly arranged on the distributor plate along the circumference, wherein the magnetic blocks, magnetic field generators, and magnetic flux detection sensors are in a one-to-one correspondence.

[0010] The adjustment and control mechanism is connected to the plurality of magnetic flux detection sensors and the plurality of magnetic field generators respectively. The plurality of magnetic flux detection sensors are used to detect the change in magnetic field strength between the plurality of magnetic blocks. The adjustment and control mechanism can obtain the gap between the cylinder and the distribution plate through the change in magnetic field strength, and control the plurality of magnetic field generators to generate different magnetic fields. The plurality of magnetic field generators can interact with the plurality of magnetic blocks to adjust the gap between the cylinder and the distribution plate.

[0011] The present invention also provides an adaptive adjustment method for the clearance between the distributor plate and the cylinder block of an axial piston pump, which uses the aforementioned adaptive adjustment device for the clearance between the distributor plate and the cylinder block of an axial piston pump.

[0012] The adjustment method includes the following steps:

[0013] S1: The adjustment and control mechanism acquires the magnetic flux signal between the multiple magnetic flux detection sensors and the multiple magnetic blocks through the multiple magnetic flux detection sensors; the adjustment and control mechanism calculates the gap size between the distribution plate and the cylinder body through the magnetic flux signal;

[0014] S2: The adjustment and control mechanism controls the multiple magnetic field generators to generate magnetic fields of different intensities and directions according to the gap between the distribution plate and the cylinder body. The multiple magnetic blocks adjust the gap between the distribution plate and the cylinder body under the action of the magnetic field.

[0015] S3: By cyclically detecting changes in magnetic flux through the multiple magnetic flux detection sensors and continuously adjusting the magnetic field generated by the multiple magnetic field generators, the gap between the distribution plate and the cylinder block can be adaptively adjusted.

[0016] In a preferred embodiment, in step S2: when the axial gap between the distribution plate and the cylinder is too large or too small, the adjustment control mechanism outputs currents of different intensities and directions to the plurality of magnetic field generators to change the gap between the distribution plate and the cylinder; when the axial gap between the plurality of magnetic flux detection sensors and the corresponding plurality of magnetic blocks is not equal and uneven wear occurs, the adjustment control mechanism adjusts the magnetic field of the magnetic field generators in different areas to correct the uneven wear.

[0017] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0018] An adaptive adjustment device for the clearance between the distributor plate and cylinder block of an axial piston pump includes a cylinder block, a distributor plate, a clearance detection mechanism, and an adjustment control mechanism. The clearance detection mechanism includes a magnetic component, a magnetic field generator, and a magnetic flux detection sensor. The magnetic component is mounted on the cylinder block, while the magnetic field generator and magnetic flux detection sensor are mounted on the distributor plate. The adjustment control mechanism is connected to both the magnetic flux detection sensor and the magnetic field generator. The magnetic flux detection sensor detects changes in magnetic field strength with the magnetic component. The adjustment control mechanism obtains the clearance between the cylinder block and the distributor plate based on these magnetic field strength changes and controls the magnetic field generator to produce different magnetic fields. The magnetic field generator interacts with the magnetic component to adjust the clearance between the cylinder block and the distributor plate. Therefore, regardless of whether the axial clearance between the magnetic plate and the cylinder block is too large or too small, or whether there is uneven wear, this device can adjust the clearance, effectively improving wear and leakage problems and increasing the pump's service life and performance. Attached Figure Description

[0019] To more clearly describe the embodiments or technical solutions of the present invention, a detailed description will be provided below in conjunction with the accompanying drawings. It should be clarified that this description is merely illustrative of the invention and not a limitation on the actual design shape and dimensions. Those skilled in the art, guided by this invention, can select the type, quantity, distribution method, etc., of materials according to specific circumstances.

[0020] Figure 1This is a schematic diagram of the adaptive adjustment device for the gap between the distributor plate and the cylinder block according to the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the magnetic sheet of the present invention;

[0022] Figure 3 This is a schematic diagram of the cylinder block of the present invention;

[0023] Figure 4 This is a schematic diagram of the distribution disk of the present invention;

[0024] Figure 5 This is a schematic diagram of the working process of the adaptive adjustment device for the gap between the distributor plate and the cylinder block of the present invention;

[0025] Reference numerals: 1. Cylinder block; 2. Magnetic sheet; 3. Locating pin hole; 4. Distributor plate; 5. Magnetic field generator; 6. Magnetic block; 7. Magnetic flux detection sensor; 8. Adjustment device Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 An adaptive adjustment device for the clearance between the distributor plate and the cylinder block of an axial piston pump is shown, comprising a cylinder block 1, a distributor plate 4, a magnetic sheet 2, a clearance detection mechanism, and an adjustment control mechanism. The clearance detection mechanism includes a magnetic component, a magnetic field generator 5, and a magnetic flux detection sensor 7. In this embodiment, the magnetic component is a plurality of magnetic blocks 6. Specifically, a plurality of magnetic blocks 6 are uniformly embedded inside the end face of the cylinder block 1. A plurality of magnetic flux detection sensors 7 are placed inside the distributor plate 4. The top and bottom of the distributor plate 4 are provided with pin holes 3 for positioning and connecting with the magnetic sheet 2. The magnetic sheet 2 is placed between the distributor plate 4 and the cylinder block 1, and is fixed to the distributor plate 4 by positioning pins, and can provide different magnetic fields according to different input currents. The adjustment control mechanism includes an amplifier, a controller, and a voltage regulator.

[0028] like Figure 2 The schematic diagram of the magnetic sheet shown illustrates that the inner and outer diameters of the magnetic sheet 2 are the same as those of the distribution plate. To simultaneously possess strong wear resistance and antimagnetic properties, the magnetic sheet can be made of a copper-zinc alloy. The magnetic sheet 2 is placed between the distribution plate 4 and the cylinder body 1, and is mounted on the distribution plate 4 via locating pins. Multiple magnetic field generators 5 are embedded inside the outer edge of the magnetic sheet 2, and the magnetic field generators 5 can be wrapped with an insulating material to prevent leakage.

[0029] like Figure 3The schematic diagram of the cylinder 1 shown illustrates that the magnetic block 6, made of a wear-resistant magnetic material, is embedded inside the outer edge of the bottom surface of the cylinder 1. The magnetic block 6 has a fixed magnetism to interact with the magnetic force generated by the magnetic field generator 5. Due to the rotation of the cylinder 1, the magnetic block 6 maintains a continuous shape to ensure that the magnetic force on the magnetic field generator 5 remains constant when the gap is constant; otherwise, it would be detrimental to the torque balance relative to the magnetic sheet 2 when the cylinder 1 rotates.

[0030] like Figure 4 The schematic diagram of the distribution plate shown illustrates that multiple magnetic flux detection sensors 7 are placed inside the distribution plate 4 and are evenly distributed along the outer edge of the distribution plate 4, in the same distribution pattern as the magnetic field generator 5, both positioned on the same radius. There is a one-to-one correspondence between the magnetic field generator 5 and the magnetic flux detection sensors 7. Each magnetic flux detection sensor 7 measures the magnetic flux at a cross-section parallel to the bottom end face of the cylinder 1. When the gap decreases, the magnetic flux increases; when the gap increases, the magnetic flux decreases. Therefore, the gap between the magnetic sheet and the cylinder 1 at the corresponding position can be calculated based on the data measured by each magnetic flux detection sensor 7. It should be noted that increasing the number of magnetic flux detection sensors 7 can improve measurement accuracy.

[0031] like Figure 5 The schematic diagram shown illustrates the working process of the adaptive adjustment device for the gap between the distribution plate and the cylinder body according to the present invention. After the power supply to the control mechanism is adjusted, the magnetic flux detection sensor 7, located inside the distribution plate, will detect the change in magnetic field strength between itself and the corresponding magnetic block 6 inside the cylinder body 1 in real time. After the magnetic flux signal is transmitted back to the controller, the controller can calculate the gap size between the two. If the gap between the two is abnormal, the controller will determine the gap situation, which can be divided into two cases. First, if the axial equal spacing gap is too large or too small, the controller will output current of different intensities and directions to the magnetic field generator 5 inside the magnetic sheet 2 to change the gap between the distribution plate 4 and the cylinder body 1. Specifically, when the gap between the two is too large, the magnetic field generator 5 will generate a magnetic field opposite to the magnetism of the magnetic block 6, reducing the distance between the magnetic sheet 2 and the cylinder body 1 to achieve the purpose of reducing the gap between the distribution plate 4 and the cylinder body 1. Conversely, when the gap between the two is too large, the magnetic field direction is changed to increase the gap between the distribution plate 4 and the cylinder body 1. Secondly, if uneven wear occurs due to unequal axial gaps between each magnetic flux detection sensor 7 and its corresponding magnetic block 6, the controller will adjust the magnetic field of different areas of the magnetic sheet 2 according to the gap size to correct the uneven wear. Specifically, the same magnetic field as the magnetic block 6 inside the cylinder 1 is applied to the area with a small gap between the cylinder 1 and the distribution plate 4, while the opposite magnetic field to the magnetic block 6 inside the cylinder 1 is applied to the area with a large gap between the cylinder 1 and the distribution plate 4. Under the combined action of both, the cylinder and the distribution plate achieve equidistant axial spacing, and the uneven wear is corrected.

[0032] Furthermore, the specific principle for calculating the gap size is as follows:

[0033] Similar to electrical circuits, magnetic circuits can be described using Ohm's law, which governs the current, voltage, and resistance. Likewise, magnetic circuits can be described using the relationships between magnetic flux (Φ), magnetomotive force (F), and magnetic reluctance (R).

[0034]

[0035] Where: Φ is magnetic flux, in Weber (Wb); F is magnetomotive force, in ampere-turns (At); R is magnetic reluctance, in ampere-turns per Weber (At / Wb).

[0036] For the liquid gap, the formula for calculating magnetic reluctance is:

[0037]

[0038] Where: l is the liquid gap length, in meters (m); μ0 is the vacuum permeability, approximately 4π × 10⁻⁶. -7 H / m; μ r is the relative magnetic permeability of the liquid; A is the cross-sectional area of ​​the liquid gap, in square meters (m²). 2 ).

[0039] The magnetomotive force F is determined by the current and the number of turns in the coil:

[0040] F = N·I (3)

[0041] Combining the above formulas, magnetic flux can be expressed as:

[0042]

[0043] To calculate the gap length l, the formula can be transformed into:

[0044]

[0045] Analysis of magnetic flux detection results and magnetic sheet wear: The axial clearance between magnetic sheet 2 and cylinder 1 is judged to be too large or too small and whether radial wear has occurred, mainly based on the data measured by each magnetic flux detection sensor 7. (Note: In this embodiment, four magnetic flux detection sensors 7 are used for illustration. "Equal to" and "same" both mean within a certain error range.)

[0046] If only one magnetic flux detection sensor 7 measures a value lower than the standard value, while the other magnetic flux detection sensors 7 measure data equal to the standard value, then the magnetic sheet 2 and the cylinder 1 will experience radial wear, and the position corresponding to this sensor is the wear position.

[0047] If two magnetic flux detection sensors 7 measure values ​​lower than the standard value, and the other two magnetic flux detection sensors 7 measure data higher than the standard value, then the magnetic sheet 2 and the cylinder 1 will experience radial wear, and the wear position will be between the two magnetic flux detection sensors 7 that measure values ​​higher than the standard value.

[0048] If the values ​​measured by the four magnetic flux detection sensors 7 are the same and lower than the standard value, then the axial equal spacing gap between the magnetic sheet 2 and the cylinder 1 is too large, and the wear will be aggravated.

[0049] If the values ​​measured by the four magnetic flux detection sensors 7 are the same and higher than the standard value, then the axial spacing between the magnetic sheet 2 and the cylinder 1 is too small, which may cause flow leakage.

[0050] The detection results of other magnetic flux detection sensors can be deduced by analogy.

[0051] When the axial clearance between the magnetic plate 2 and the cylinder 1 is too small, the current direction in all magnetic field generators 5 should be adjusted so that the magnetic field and the magnetic poles of the magnetic block 6 are opposite, and the current magnitude should be increased to generate a greater attractive force. Similarly, when the axial clearance between the magnetic plate 2 and the cylinder 1 is too large, the current direction in all magnetic field generators 5 should be adjusted so that the magnetic field and the magnetic poles of the magnetic block are the same, and the current magnitude should be increased to generate a greater attractive force. When radial wear occurs between the magnetic plate 2 and the cylinder 1, the current direction in the magnetic field generator at the smaller clearance should be adjusted so that the magnetic field and the magnetic poles of the magnetic block are the same, and the current magnitude should be increased to generate a greater repulsive force. At the same time, the current direction in the magnetic field generator 5 at the larger clearance should be adjusted so that the magnetic field and the magnetic poles of the magnetic block 6 are opposite, and the current magnitude should be increased to generate a greater attractive force.

[0052] The above description is merely a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention by those skilled in the art within the scope of the technology disclosed in the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. An adaptive adjustment device for the clearance between the distributor plate and the cylinder block of an axial piston pump, characterized in that, The system includes a cylinder block, a distribution plate, a gap detection mechanism, and an adjustment and control mechanism. The gap detection mechanism includes a magnetic component, a magnetic field generator, and a magnetic flux detection sensor. The magnetic component is mounted on the cylinder block, and the magnetic field generator and magnetic flux detection sensor are mounted on the distribution plate. The adjustment and control mechanism is connected to the magnetic flux detection sensor and the magnetic field generator. The magnetic flux detection sensor detects changes in magnetic field strength between itself and the magnetic component. The adjustment and control mechanism obtains the gap between the cylinder block and the distribution plate through these changes in magnetic field strength and controls the magnetic field generator to generate different magnetic fields. The magnetic field generator interacts with the magnetic component to adjust the gap between the cylinder block and the distribution plate. The magnetic component consists of multiple magnetic blocks, which are embedded inside the end face of the cylinder body. The multiple magnetic blocks are evenly spaced along a circumferential direction on a circumference with the same outer diameter as the distribution plate, and are placed between the two plunger cavities of the cylinder body.

2. The adaptive adjustment device for the clearance between the axial piston pump distributor plate and the cylinder block as described in claim 1, characterized in that: It includes a magnetic sheet, which is fixedly connected to the distribution plate; inside the magnetic sheet, multiple magnetic field generators are uniformly arranged on a circumference with the same outer diameter as the distribution plate, and the magnetic field generators can generate different magnetic fields according to the input current; the multiple magnetic blocks adjust the gap between the cylinder and the distribution plate under the action of the magnetic fields of the multiple magnetic field generators.

3. The adaptive adjustment device for the clearance between the axial piston pump distributor plate and the cylinder block as described in claim 2, characterized in that: Multiple magnetic flux detection sensors are placed inside the distribution plate and are evenly distributed along the outer edge of the distribution plate.

4. The adaptive adjustment device for the clearance between the axial piston pump distributor plate and the cylinder block as described in claim 3, characterized in that: The magnetic field generator and the magnetic flux detection sensor are in a one-to-one correspondence.

5. An adaptive adjustment device for the clearance between the distributor plate and the cylinder block of an axial piston pump, characterized in that, It includes a cylinder block, a distribution plate, a gap detection mechanism, and an adjustment and control mechanism; the gap detection mechanism includes multiple magnetic blocks, multiple magnetic field generators, and multiple magnetic flux detection sensors; the multiple magnetic blocks are evenly arranged on the cylinder block along the circumference, the multiple magnetic field generators are evenly arranged on the distribution plate along the circumference, and the multiple magnetic flux detection sensors are evenly arranged on the distribution plate along the circumference, with a one-to-one correspondence between the magnetic field generators and the magnetic flux detection sensors; The adjustment and control mechanism is connected to the plurality of magnetic flux detection sensors and the plurality of magnetic field generators respectively. The plurality of magnetic flux detection sensors are used to detect the change in magnetic field strength between the plurality of magnetic blocks. The adjustment and control mechanism can obtain the gap between the cylinder and the distribution plate through the change in magnetic field strength, and control the plurality of magnetic field generators to generate different magnetic fields. The plurality of magnetic field generators can interact with the plurality of magnetic blocks to adjust the gap between the cylinder and the distribution plate.

6. A method for adaptive adjustment of the clearance between the distributor plate and the cylinder block of an axial piston pump, characterized in that, An adaptive adjustment device for the clearance between the axial piston pump distributor plate and the cylinder block as described in claim 5 was used. The adjustment method includes the following steps: S1: The adjustment and control mechanism acquires the magnetic flux signal between the multiple magnetic flux detection sensors and the multiple magnetic blocks through the multiple magnetic flux detection sensors; the adjustment and control mechanism calculates the gap size between the distribution plate and the cylinder body through the magnetic flux signal; S2: The adjustment and control mechanism controls the multiple magnetic field generators to generate magnetic fields of different intensities and directions according to the gap between the distribution plate and the cylinder body. The multiple magnetic blocks adjust the gap between the distribution plate and the cylinder body under the action of the magnetic field. S3: By cyclically detecting changes in magnetic flux through the multiple magnetic flux detection sensors and continuously adjusting the magnetic field generated by the multiple magnetic field generators, the gap between the distribution plate and the cylinder block can be adaptively adjusted.

7. The adaptive adjustment method for the clearance between the distributor plate and the cylinder block of an axial piston pump as described in claim 6, characterized in that: In step S2: when the axial gap between the distribution plate and the cylinder is too large or too small, the adjustment and control mechanism outputs currents of different intensities and directions to the plurality of magnetic field generators to change the gap between the distribution plate and the cylinder; when the axial gap between the plurality of magnetic flux detection sensors and the corresponding plurality of magnetic blocks is not equal and uneven wear occurs, the adjustment and control mechanism corrects the uneven wear by adjusting the magnetic field of the magnetic field generators in different areas.

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